12165863813 has 2 divisors, whose sum is σ = 12165863814. Its totient is φ = 12165863812.

The previous prime is 12165863807. The next prime is 12165863839. The reversal of 12165863813 is 31836856121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868577249 + 297286564 = 108943^2 + 17242^2 .

It is a cyclic number.

It is not a de Polignac number, because 12165863813 - 2¹⁰ = 12165862789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12165863803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6082931906 + 6082931907.

It is an arithmetic number, because the mean of its divisors is an integer number (6082931907).

Almost surely, 2^12165863813 is an apocalyptic number.

It is an amenable number.

12165863813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12165863813 is an equidigital number, since it uses as much as digits as its factorization.

12165863813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The spelling of 12165863813 in words is "twelve billion, one hundred sixty-five million, eight hundred sixty-three thousand, eight hundred thirteen".